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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4290862f1f363c78ea09b3239402c19c1889e516613fbab7bc13819ee8a838' 
  AND token = 'GpI9/+5nkADgrEIPC3pk43Rj7l2O2MLEXBL9JuNIPW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}